The output BLK2H of three-phase inrush detector INRPHAR1 enables either blocking
the function or multiplying the active settings for any of the available overcurrent or
earth-fault function blocks.
INRPHAR1
BLOCK BLK2H
INRPHAR1_BLK2H
GUID-984A0C31-460F-48F5-AA9D-FD0F798DB0EE V1 EN
Figure 336: Inrush detector function
Two negative-sequence overcurrent protection stages NSPTOC1 and NSPTOC2 are
provided for phase unbalance protection. These functions are used to protect the
feeder against phase unbalance. Both negative sequence overcurrent protections are
blocked in case of detection of a failure in secondary circuit of current transformer.
NSPTOC1
BLOCK
ENA_MULT
OPERATE
START
NSPTOC2
BLOCK
ENA_MULT
OPERATE
START
OR
B1
B2
O
NSPTOC1_OPERATE
NSPTOC1_OPERATE
NSPTOC2_OPERATE
NSPTOC2_OPERATE
NSPTOC1_START
NSPTOC2_START
CCSPVC1_FAIL
CCSPVC1_FAIL
NSPTOC_OPERATE
GUID-7C84F97A-94E1-4D1F-87CD-942C8D9088A1 V2 EN
Figure 337: Negative sequence overcurrent protection function
Four stages are provided for non-directional earth-fault protection. One stage is
dedicated to sensitive earth-fault protection.
1MRS756378 S Section 3
REF615 standard configurations
REF615 233
Application Manual
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